If you have ever had to fix a modern desktop motherboard, you might have noticed that the BIOS (UEFI) SPI flash is 1.8V – which means you can no longer use a Raspberry Pi or a CH341 adapter directly, and you’d need to use a 1.8V level shifter of some sort. Now, some of us can wait for a 1.8V level shifter adapter from an online store of your choosing, but [treble] got a “BIOS flash failed” motherboard from Facebook Marketplace, and decided to make it work immediately.
This is a companion discussion topic for the original entry at https://hackaday.com/2024/03/07/motherboard-revived-with-simplest-1-8v-spi-shifter-ever/